github.com/cloudwego/frugal@v0.1.15/internal/binary/encoder/hash.go (about)

     1  /*
     2   * Copyright 2022 ByteDance Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package encoder
    18  
    19  import (
    20      `unsafe`
    21  )
    22  
    23  //go:noescape
    24  //go:linkname strhash runtime.strhash
    25  //goland:noinspection GoUnusedParameter
    26  func strhash(p unsafe.Pointer, h uintptr) uintptr
    27  
    28  func mkhash(v int) int {
    29      if v != 0 {
    30          return v
    31      } else {
    32          return 1
    33      }
    34  }
    35  
    36  func hash64(h uint64) int {
    37      h ^= h >> 33
    38      h *= 0x9e3779b97f4a7c15
    39      return mkhash(int(h &^ (1 << 63)))
    40  }
    41  
    42  func hashstr(p unsafe.Pointer) int {
    43      return mkhash(int(strhash(p, 0) &^ (1 << 63)))
    44  }